Adhesive tape



March 3, 1936'.

ADHESIVE TAPE Filed Dec. 7, 1931 F. w. HUMPHNER 2,032,845

Patented Mar. 3, 1936 PATENT yorrlcle.

ADHESIVE TAPE Ferdinand W. Humplmer, Oak Park, Ill., assigner to Mid-States Gnmmed Paper Company, a corporation of Illinois Application December '1, 1931, serial No. 579,601

1 claim. (c1. sii-cs) This invention relates to adhesive tape or sheets and more particularly to tape of the pressuresensitive adhesive type.

An object of the invention is to provide adhesive tape or sheets which, when stacked in sheets or wound in rolls, may be readily separated or unwound and which may be applied to a surface to provide a straight even edge. A further object is to provide an adhesive strip of sturdy and of durable construction which may be manufactured at small cost and which is particularly useful for attaching fabric, paper sheets and the like to a metallicbody. Other objects or advantages will be apparent as the specification proceeds.

The invention is fully described inthe following specication and shown in the accompanylng drawing, in which is given a broken perspective view of an adhesive strip embodying vmy inventlon, the adhesive and metallic coatings being partially unrolled and separated from the paper In'the illustration given, A represents a paper web or body;A B, pressure-sensitive adhesive applied to one side of the paper strip; and C, a metallic coating or layer applied to the other face of the paper strip;

The paper may be of any suitable kind, suchA as kraft, manila or the like.

The pressure-sensitive adhesive B may also be of any suitable type. Such an adhesive may be formed by methods which are well known in the art.4 For example, it may be formed by mixing crude rubber with zinc oxide, and the material may be maintained in its tacky stage by mixture with suitable ingredients such as oil, pitch, etc.

The metal coating or surface C may be formed of a suitable metallic powder compounded with other ingredients or by applying a metal foil to the surface of the paper body A.

'I'he metal powder is preferably mixed with an adhesive or binder and then applied to the surface of the paper by any of the usual methods. The metal surface may then be calendered to produce a high finish or left with a dull finish.

By way of example, 'a silver coating material may be produced by compounding 15% of powdered tin, lead, 10%'casein or glue (bone or hide glue), clay, 1% wax, preferably of vegetable origin, with the balance water.

In place of the metals mentioned, other sultable metals, such as aluminum, bronze, etc. may be employed. Also, shellac or lacquer may be used to replace the casein or glue. Wide variations in the proportions and types of metals and other bonding or 'body materials used may be made without departing from the spirit of my invention. I desire to have a metal surface or coating which will cover the surface of thepaper strip opposite the pressure-sensitive adhesive and for this purpose any of the methods which are available or which will readily suggest themselves for coating the paper with a metallic surface may be employed. i'

If desired, instead of coating the paper surface with a metallic alloy or compound, a thin metal foil of tinfaluminum, copper, brass, etc. may be bonded to the paper sheet with a suitable adhesive.

Instead of calendering the metal surface, to produceV a high nnish, the surfacev may be subjected to friction as by rubbing, etc. If desired, the surf-ace may be roughened by embossing or by passing the metallic surfaced paper through rolls provided with 4supercially roughened surfaces.

The product may also be improved by leaving the metallic compound in a rough and unburnished state upon the paper surface.

The finished tape or sheet, is particularly useful in connection with the painting of automobiles by spraying, particularly where a two-tone color is desired. In such operations, itis important to provide a fine straight edge which will set off one color from the other. By embodying a metal surface for the tape or sheet, it is found that a straight ruler-like edge is obtained. The tape may be readily applied by the workman so as to form an accurate straight line below which thepsprayed material is to be shielded from the vehicle body. In the rolling or stacking of tape or sheets, thepressure-sensitive adhesive does not permanently adhere to the metallic backing but is readily separated therefrom. The metal surface, also, does not weaken or deterlorate the rubber adhesive, on long standing, as do most of the chemicals with which such paper has heretofore been treated. Because of these facts, the adhesive tape or sheet may be reused a number of times.

The metal backing is unusually repellent-to pressure-sensitive adhesive of the character described and therefore very little splitting stress is imposed on the papervin unwinding a roll of-` tape also, with the metallic coating it is possible to use a very thin paper which oers greater resistance to splitting.

To avoid all possibilty of the paper splitting, I prefer to use for the sheet or strip A asplit paper web. Such a webphas no tendency to split,

and at the same time provides a loose fibrous surface to vwhich the rubber adhesive'layer B may 55 2 @essere be attached. At the same time, the split web is thin and increases theilexibility of the tape product.

In order to obtain a satisfactory split web backing, I prefer to employ the following method. I iirst coat the two sides oi' a splittable paper or-strip with the metal backing C. The two halves oi' the paper web are then drawn apart,i by any suitable method of splitting,` with. the metal backing C secured to the outer side oi' each web. Rubber adhesive B is tlieiu1 applied to the inner side of each strip, the loose libres exposed thereon serving to etleotiveiy bond the adhesive to the web.

Whilethe tape has been described as useful in connection with the painting of metal bodies, it may be employed for forming designs on am object by cutting' o stencil on thetape or sheet and applying it to the object to be painted or otherwise treated; also, it may be used for other purposes for which adhesive tape is ordinarily employed.

The foregoing detailed description has been I given for clearness of understanding only, and no unnecessary limitations should be understood thereiron'i,` but the appended claim should be construed as broadly as permissible, in view of the prior art.

Iclaim:

An adhesive tape or sheet, comprising a web of paper, a lcoating o! preserve-sensitive adhesive on one side thereof, and a bare metallic coating on the other side oi said web, said metallic coatingcompx'ising e. powdered metal, casein, clay,

md wax.

MRDINANB W. HUMPHNER. 

